Mercury:

Venus:

Earth:

Mars:

Our Solar System

Planet

Facts

Mercury is the smallest and closest to the Sun

Orbital period of about 88 Earth daysRadius: 2,440 kmSurface area: 74,800,000 kmDistance from Sun: 57,909,175 kmLength of day: 58d 15h 30m30% size of EarthTemperature: 700 Kelvin (Daytime) 100 Kelvin(Nighttime)Mass: 328.5E21 kg (0.055 Earth mass)Venus is the second planet from the Sun. It has nonatural satellite. It is named after the Romangoddess of love and beautyOrbits the Sun every 224.7 Earth daysSurface area: 460,234,317 kmRadius: 6,052 kmMass: 4.867E24 kg (0.815 Earth mass)Length of day: 116d 18h 0mDistance from Sun: 108,200,000 kmEarth, also known as the world, Terra, or Gaia, is thethird planet from the Sun, the densest planet in theSolar System, the largest of the Solar System's fourterrestrial planets, and the only celestial body knownto accommodate life.Radius: 6,371 kmAge: 4.54 billion yearsSurface area: 510,072,000 kmDistance from Sun: 149,600,000 kmPopulation: 7.125 billion (2013)Moon(s): Moon (Luna)Orbit: 365 daysLength of a day: 24hMars is the fourth planet from the Sun and thesecond smallest planet in the Solar System, afterMercury.Surface area: 144,798,500 km

Jupiter is the fifth planet from the Sun and the largestplanet in the Solar System. It is a gas giant withmass one-thousandth of that of the Sun but is twoand a half times the mass of all the other planets inthe Solar System combined.Radius: 69,911 kmSurface area: 61,418,738,571 kmMass: 1.898E27 kg (317.8 Earth mass)Gravity: 24.79 m/sDistance from Sun: 778,500,000 kmMoons (main): Io, Europa, Ganymede, Callisto,Amalthea, Adrastea, Metis

An invisible force that is found in extremely large object.

This force pulls entities towards the centre of that object.

What role does it play in our universe?

Gravity is the powerful force that glues our universe

together. Gravity helped form our solar system, the planets,and the stars. It holds the planets in orbit around the Sun,and moons in orbit around the planets. The gravitational pullof the Sun and Moon creates the tides on Earth. Far beyondour solar system, the irresistible force of gravity is collapsingstellar cores into amazing - and bizarre - objects in ouruniverse--neutron stars and black holes.

Big Bang Theory

Notes

Edwin Hubble found out that the universe was expanding by realising that cosmic matter (stars, planets, galaxies,etc.) were moving further away from earth. From this information Cosmologists have discovered that byhypothetically reversing time, far back enough it it possible to understand the creation of the universe.From their understanding of the behaviour of the universe, cosmologists have come to a conclusion that theuniverse was created approximately 13.8 billion years ago and was originally no bigger than an atom. But this atomradiated incredible amounts of energy and burned at an intense heat.Then it burst forth at an unimaginable speed creating (and expanding) the boundaries of space. It later cooled downand condensed into matter and antimatter. When the two collide they explode destroying both entities, but luckilythere was more matter than antimatter. The residue of this later explosion(s) is what were the fundamental buildingblocks of the universe we know now.It is possible to say that we were made from the smoke of the big bang

Gravity

After 10 minutes of the cosmos birth it was already 10, 000 lightyears in diameterThe residue from the later explosions then spread out and cooled in the span of 330,000 years.